The Persian Empire was one of the most mysterious civilizations in the ancient world. Persia became an empire under the Cyrus the Great, who created a policy of religious and cultural tolerance that became thehallmark of Persian rule. Engineering feats include an innovative system of water management; a cross-continent paved roadway stretching 1500 miles; a canal linking the Nile to the Red Sea; and the creation of one of the Seven Wonders of the World, the Mausoleum of Maussollos. The rivalry between Persia and Athens led to a 30-year war known as the Persian Wars, the outcome of which helped create the world we live in today. The Achaemenid Empire (/əˈkiːmənɪd/; Old Persian: Haxāmanišiyā; c. 550--330 BCE), or First Persian Empire, was an empire in Western and Central Asia, founded in the 6th century BCE by Cyrus the Great. The dynasty draws its name from king Achaemenes, who ruled Persis between 705 BCE and 675 BCE. The empire expanded to eventually rule over significant portions of the ancient world which at around 500 BCE stretched from the Indus Valley in the east, to Thrace and Macedon on the northeastern border of Greece, making it the biggest empire the world had yet seen. The Achaemenid Empire would eventually control Egypt as well. It was ruled by a series of monarchs who unified its disparate tribes and nationalities by constructing a complex network of roads. By the 600s BCE, the Persians (Parsa) had settled in the southwest Iranian plateau, bounded on the west by the Tigris River and on the south by the Persian Gulf; this region came to be their heartland. It was from this region that Cyrus the Great would advance to defeat the Median, the Lydian, and the Babylonian Empires, to form the Achaemenid Empire. At the height of its power after the conquest of Egypt, the empire encompassed approximately 8 million square kilometers spanning three continents: Asia, Africa and Europe. At its greatest extent, the empire included the modern territories of Iran, Iraq, Syria, Jordan, Israel, Palestine, Lebanon, all significant population centers of ancient Egypt as far west as Libya, Turkey, Thrace and Macedonia, much of the Black Sea coastal regions, Armenia, Georgia, Azerbaijan, much of Central Asia, Afghanistan, northern Saudi Arabia, Pakistan, and parts of Oman and the UAE. It is noted in Western history as the antagonist foe of the Greek city states during the Greco-Persian Wars, for emancipation of slaves including the Jewish people from their Babylonian captivity, and for instituting infrastructures such as a postal system, road systems, and the usage of an official language, Aramaic, throughout its territories. The empire had a centralised, bureaucratic administration under the King and a large professional army and civil services, inspiring similar developments in later empires. The delegation of power to local governments eventually weakened the king's central authority, causing resources to be expended in attempts to subdue local rebellions. This accounts for the dis-unification of the region by the time Alexander the Great invaded Persia in 334 BCE. This viewpoint however is challenged by some modern scholars who argue that the Achaemenid Empire was not facing any such crisis around the time of Alexander, and that only internal succession struggles within the Achaemenid family ever came close to weakening the Empire. Alexander, an avid admirer of Cyrus the Great, would eventually cause the collapse of the empire and its disintegration around 330 BCE into what later became the Ptolemaic Kingdom and Seleucid Empire, in addition to other minor territories which gained independence at that time. The Iranian Culture of the central plateau, however, continued to thrive and eventually reclaimed power by the 2nd century BCE. The historical mark of the Achaemenid Empire went far beyond its territorial and military influences and included cultural, social, technological and religious influences as well. Many Athenians adopted Achaemenid customs in their daily lives in a reciprocal cultural exchange, some being employed by, or allied to the Persian kings. The impact of Cyrus the Great's Edict of Restoration is mentioned in Judeo-Christian texts and the empire was instrumental in the spread of Zoroastrianism as far east as China. Even Alexander the Great, the man who would set out to conquer this vast empire, would respect its customs, by enforcing respect for the royal Persian kings including Cyrus the Great, and even by appearing in proskynesis, a Persian royal custom, despite stern Macedonian disapproval. The Persian empire would also set the tone for the politics, heritage and history of modern Persia (now called Iran). In 480 BCE, it is estimated that 50 million people lived in the Achaemenid Empire or about 44% of the world's population at the time, making it by population percentage the largest empire.

• published: 04 Sep 2013
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